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P0966 is a diagnostic trouble code (DTC) for "Pressure Control Solenoid B Control Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P0966 is the fault code for Pressure Control Solenoid B Control Circuit Low, indicating a problem in the system which controls the pressure in the automatic transmission clutch. Concurrent codes may include P0968, and P1773.
This code typically means there is a problem related to the pressure control solenoid valve, which determines the flow and pressure of transmission oil according to driving conditions. This results in the vehicle’s computer detecting voltage outside of the normal range.
Several possibilities could cause a vehicle to set this code, including:
While mechanical problems can cause this DTC, the issue is more often electrical.
The most common symptom is an illuminated Check Engine Light. The vehicle may also have problems shifting gears, such as harsh upshifts, or flares or shock upon upshifting. If there are downshifting abnormalities, that is more likely a sign of an issue with the pressure control solenoid A. You may also notice decreased fuel efficiency.
A technician may carry out the following diagnostic steps:
One of the costliest errors with this fault is to replace the transmission without checking all of the other possible issues. This code is rarely caused by a mechanical problem with the transmission. The wiring harness is a frequent culprit. The problem may also lie in the ECM or PCM – if a used computer has been installed in the vehicle, it may be storing the code despite the lack of a malfunction. In addition, this DTC is sometimes mistaken for a performance problem.
While the problem is often electrical, this DTC can result in very real transmission malfunctions. If not addressed so that the proper fluid pressure can resume, the transmission could eventually be damaged to the point of needing to be replaced. It’s best to address the code as soon as you see that it has set.
Possible solutions for this error include:
If the code does not return after being cleared from the computer and car road tested again, it could indicate an intermittent failure. These can be difficult to diagnose and may require allowing the code to set consistently before it can be addressed. You should always check for loose connections if there appears to be an intermittent failure.
It’s important to get a correct diagnosis for codes relating to the transmission, because if not properly repaired, serious transmission damage could result. Special equipment is often required to test voltage and resistance, and to verify the source of the problem, so this is one repair that is usually best left to a professional technician.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.